Impulse-transmitter.



W. H. D. FORD.

IMPULSE TRANSMITTER.

APPLICATION FILED JUNE'IO, 1916.

1,286,981 Patented Dec. 10, 1918.

//7 van for 1 WIN/57m h. 0. Fora.

, STATES-PATENT OFFICE.

WILLIAM 3.1). roan-or new roux, N. m, assreuos. 'ro wias'rnmw ELECTRIC comraiw,

mconroaarnn, onnnw YORK, N. m, A coaromrron or. NEW Yoax.

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To all whom it may concern; Be it known that I, WILLIAM H. Form, a citizen of the United States,r'es1d1ng at New York, inthe county of Bronx and State Y of' New York, have invented certain new and useful Improvements in Impulse-Transmitters, of which the following is a full,

clear, concise, and exact description.

This invention relates to impulse transmitters for use in connection with party line or'like systems wherein there are a'plurality of sub'scriber or way-stations on the same line, .each station being provided w1th a selector-mechanism adapted, in response to 21 meshes with a worm on a governor shaft 22, WhlCh is arranged at'right angles to the sent over the hue, to close a sig- -n circuit at that station, the number of im forcalling the stations being difp ferent for each particular selector.

This invention has for its object the pr ovision of an impulse transmitter WhlCh Wlllbe compact, sure and quiet inits operation, easily manufactured, and one which can be easily and s eedily ad'usted to transmlt the proper com ination .o pulses for callmg any particular station on the line.

The impulse transmitter to which this invention relates comprises in general a clockwork mechamsm m which ener is stored up by the turning of a handle w 'ch winds a spring. When the handle is released, the spring revolves, a shaft, upon.

- which is mounted a toothed wheel'adapted to operate contact springs to make and break a circuit. Two adjustable cam members are provided for covering up certain .of the teeth to permit of the transmitting of any desired combination of impulses. There is also provided means independent 'of the toothed'wheel which, in the operation of the transmitter, renders the contact-springs operatively independent .of the toothed wheel duri'nga portlon ofthe travel thereof.

In the drawings illustrating this inven-' I tion, Figure 1 is a side elevation of the impulse transmitter; Fig. 2 is .a view of the back end of the im ulse transmitter; and

Fi 3 is a view of .t e back end of. the impulse transmitter with 'a portion a 'of the toothed'liwheel broken. away to show the means for rendering the" contactsprings operatively independent of the toothed wheel during a portion of the travel thereof.

Referring to the drawings, 5- and 6 designate frame plate members secured together by rods 7 and 8. Supported in these frame Specificationof Ilette -s ratent. Patented Dec. 10, 1918. Appllcation medhnem,1216. Serial no, 102,878.

plates 5 and 6 areshafts 10 and 11, the

shaft 10 constituting a driving and the shaft 11 the driven shafts of the mechanism. Loosely mounted upon the shaft 10 is a gear wheel '14 adapted to be drivenby a spiral spring 15 on said shaft. Gear wheel .14 meshes with .a pinion 16 on the shaft .11, which pinion is secured to a gear wheel 17, also on the shaft 11, gear wheel 17 being in mesh with a pinion 18 loosely mounted upon the shaft 10-and secured to a gear wheel 19. The gear wheel 19 in turn meshes with a pinion 20,'loosely mounted upon the shaft 11 and secured to a gear wheel 21. The gear wheel shafts 10 and .11, and supported between arms 23,23- formed integrally with the plate 6.

The governor consists of two weighted spring arms 24 and 25, which, as the governor shaft 22 is rotated, are caused to throw the weights outwardly against the inner face groups of teeth 31, 31 which are adapted to cooperate with spring contacts 32 and 33 to alternately make and break, a circuit including these contacts. As shown, the'wheel 30 is provided. with portions 34, 34 free" from teeth, their radii being the same as the .radius of the wheel 30 at the base of the teeth 31, 31 in one of which portions the free end of spring 32 is normally positioned out ofengagement with the spring 33.

The wheel 30 is provided with a portion 37 having a radius equal to that of the outer face of the teeth 31, 31, and which, when passing maintalns contact springs 32 and 33 in engagement to control the duration of the operation of the signaling device at'the selected station. As the free end of spring contact 32 "rides on top of a tooth, a short impulse of current is sent over the'line, and when the springcontact 32 is betweentwo teeth, current 1s removed from the line for a short under the free end of spring 32,

time. The number of effective teeth in different groups which pass under contact spring 32, is determined by means of adjustable plates or cam members 38 and 39 pivotally mounted upon the end of shaft 11 in juxtaposition to the toothed wheel 30, each cam member being provided with an arcuated slot 40 concentric with the shaft 11. A screw 11 passing through each slot into the face of the toothed wheel, is adapted to secure the cam members 38 and 39 in any adjusted position. The periphery of each cam member preferably has a radius equal to that of the outer faces of the teeth 31, 31.

The toothed wheel 30 is adapted to make two complete revolutions each time a call is made, and in this connection is provided on one face with a projecting stop lug 50, adapted to engage a movable stop lug 51 carried by the shaft 10. A cam member 55 is also mounted on the shaft 10 and is adapted to rotate therewith. The cam member 55 is provided with a surface 56 which coiiperates with the curved end of the long arm of a bell-crank lever 57 pivoted at 58 on the frame plate 6 to move the lever 57 about its pivot point. As the lever 57 is moved about its pivot point, a' projection 59 on the short arm thereof engages the contact spring 32 and raises it out of engagement with wheel 30 and into engagement with contact spring 33. In the-operation of these particular parts, the shaft 10 is turned by a handle 52 through an angle of about 180 degrees until the stop lug 51 comes into contact with a stop pin 53 projecting from the frame plate 6. As the handle 52 is turned,- the cam member 55 is moved with the shaft 10 and stop lug 51, the end of the long arm of lever 57 riding along the surface 56 and surface 65 of the cam member 55. When the handle is released, the two shafts 10 and 11 travel at such a relative speed that the wheel 30 is caused to make two complete revolutions while the stop lug 51 is moving back into position to engage stop pin 50 on said wheel. As the shaft 10 revolves under action of the spring 15, the wheel 30 is revolved in the direction of the arrow and the teeth 31, 31 thereof engage the free end of contact spring 32 to cause the intermittent engagement of contact springs 32 and 33. When the wheel 30, in its first revolution, has brought the surface 37 thereof under the free end of contact spring 32 the surface 56 of cam member 55 engages the end of the lon arm of lever 57 and moves the lever 57 a out its pivot point to cause the projection 59 to raise and maintain the contact spring 32 out of engagement with wheel 30, and the contact springs 32 and 33 in engagement for a complete revolution of wheel 30. The surface 56 of cam member 55 now disengages the end of the long arm of the lever 57, permitting the bell-crank lever ing plate 54, so that the handle 52 thereon may-be easily manipulated from the front of the transmitter.

The contact springs 32 and 33 are mounted upon a supporting lug 60 formed integrally with the frame plate 6, one of said contact springs beinp: electrically connected with said frame through the toothed Wheel 30 or through the projection 59 on lever 57, and the other of said springs being electrically connected I with a lug 61 insulated from the frame. The plate 54'and transmitter structure supported thereby is adapted to be mounted in a suitable casing or box with the frame thereof in contact with one circuit terminal, while the lug 61 is adapted to engage a separate circuit terminal.

What is claimed is: 1. In an impulse transmitter, a driving shaft, a driven shaft, a rotatable toothed wheel, carried by said driven shaft, normally disengaged contact springs brought into and out of engagement by the teeth of said wheel, and a lever controlled by said driving shaft for rendering said contact springs operatively independent of said toothed wheel during a portion of the travel ofsaid wheel;

2. In an impulse transmitter, a drivin shaft, a driven shaft, arotatable toothe wheel, carried by said driven shaft, normally disengaged contact springs brought into and out of engagement by the teeth of said wheel, and means controlled by said driving shaft for moving said contact springs out of operative relation to said .toothed wheel during a portion of the travel of said wheel.

3. In an impulse transmitter, a driving shaft, a driven shaft, a rotatable toothed wheel carrie' by said driven shaft, normally disengaged contact springs brought into and out-of engagement by the teeth of said wheel, a cam member carried by said driving shaft, and a bell crank lever operated by said cam member for moving-said contact springs out of operative relation to. said toothed wheel during a portion of the wheel carried by said driven shaft, normally disengaged'contact springs brought into and out of engagement bv the teeth of said wheel, a cam member-carried by said driving shaft, and 'a lever operated by said cam member to move said contact springs out of operative relation to said toothed.

wheel and to maintain said contact springs 10 in engagement during a portion of the travel of said toothed wheel.

In vwitness whereof, Ihereunto subscribe "my name this 8th day of J time A. D., 1916. 1

WILLIAM H. D. FORD; 

